Fluid-pressure engine.



N0. 818,121. PATENTED APR. 1'7, 1906. E. ROAGH.

FLUID PRESSURE ENGINE.

APPLICATION FILED MAR. 15. 1904.

/N VEA/TO i? ii'nrrnn STATES FATE T FFTQE.

EDWARD ROACH, OF CHESTERFIELD, ENGLAND.

FLUlID-PRESSURE ENGINE.

Specification of Letters Patent.

Patented April 17, 1906.

Application filed March 15,1904. Serial No. 198,271.

cation.

This invention has referenceto steam and other fluid-pressure engines or machines; and it consists of certain improvements hereinafter describedwhereby the speed of the pistons of engines or machines is decreased without reducing the number of revolutions or strokes in a given time and also decreasing the size and cost and the space occupied.

The invention will be described with the aid of the accompanying drawings, in which Figure l is a sectional elevation of the engine, and Fig. 2 is an outside elevation of same. Fig. 3 is a longitudinal section through the cylinder; and Fig. {l is a crossz ection through the cylinder, taken at X X,

In the drawings, a represents the motorchamber in which the piston works, and b is the piston.

c is the fulcrum-shaft to which the piston is connected, and (Z is the main or crank shaft of the engine.

The piston b is mounted that is, fixedon the fulcrum-shaft c and passes out through stufling-boxes e on the ends of the chamber b. The chamber a, in which the piston works, is in the general form of a segment of a circle, and the piston b vibrates about the axis of the shaft 0 in this chamber.

Steam is distributed to and from the opposite sides of the piston Z) through inlet and exhaust ports f g in one end of the chamber a, by valve h in the casing 'L, and worked by an eccentric and valve-rod Zc.

The fulcrum or piston shaft 0 is at the apex a of the segmental chamber a, and it makes a steam-tight joint with this portion of the chamber, and round its edge where it works in connection with the ends and bottom of the chamber a it is provided with a spring or other packing p of any suitable kind.

Motion is transmitted from the pistonshaft 0 to the crank-shaft cZ through an arm or lever Z, fixed on the end of said shaft, and a connecting-rod m on the end of the arm Z and working at its opposite end on the disk or crank n on the shaft d. If desired, there may be two of the arms Z, one on each end of the shaft 0, and a connecting-rod from each of these arms for transmitting motion to the main shaft d. In the case shown the chamber a is arranged with its apex uppermost; but, if desired, it may be inverted and the apex end or portion attached to the bedplate of the engine.

In action the piston 17 is oscillated to andfro by the action of the steam or other fluid admitted to and exhausted from the chamber a to the opposite sides of the piston, such distribution of steam being effected by the valve h and steam and exhaust ports of f and g, and this motion is transmitted to the crank or cranks or disk or disks on the shaft (1 by the connecting rod or rods m, and thus the rotation of the crank-shaft is produced by the vibration of the piston b.

If desired, the outside arm or arms Z may have connected with it or them a guide for giving it support, especially in cases for transmitting large powers.

Having now particularly described my invention, what I claim as new, and desire to secure by Letters Patent, .is

In a steam or other fluid pressure engine, a chamber in the general form of a segment of a circle and the piston filling the same from side to side working therein, the fulcrumshaft 0 connected to the piston, and at the part opposite the piston 19, working in contact and making joint with the apex a of the chamber, an arm Z on the shaft 0 outside the chamber, a crank-shaft d, a disk n mounted thereon, a pin on said disk, a rod m connected at one end to said pin and at the other end to the arm Z, a valve-chambert on one of the upright segment-shaped sides of the pistonchamber, ports f leading from the valvechamber to the piston-chamber, an exhaustport 9, a slide-valve in said valve-chamber controllin said ports, an eccentric on the crank-shaft d and connections therefrom to the slide-valve for controlling the same, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

EDWARD ROACH.

Witnesses:

J. H. L. TREVORROW, I-I. TREVORROW. 

